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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f13c09f7f35bf4eae68d38f99db6887531d8528db6414858474640e7484e18' 
  AND token = 'QIxJcQ7jGv6EDCDj05c92M8CgVIMm4XY7jSc1W0MLHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}