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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c805bdd4d67d19c5c00561e7c18e79415ec01279a446a0383523fd989d23bc5' 
  AND token = 'WAmKabQ7yEqhwTRqO/rw0sWhIDNxDA5UbsdfTMGs4fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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