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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c6278f05e9e807b2aa5e47d963844a26a29d3439666baa6581e0536d63c6a5' 
  AND token = 'vy1raQqH3YuQJdQ83BNh/hjNZE9MIEbin80BKI7VSRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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