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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffcb758b30160f16a7b4042c3dd560f6b467ef177f5d0ced8586eb3fc890085' 
  AND token = 'pk244YBB9gY5jAlCQtBoOWS3+gmCEFX4D/oMbBIw45Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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