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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3f2c8a8ff4dd8bb4619cb87ad9553c6da939311942b3aa8e31f75e4cae193f' 
  AND token = 'rtcGrYvPGV9UMJNbUUcIWKgZBbUb4vSIisMCx3D34Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00369

JSON explain

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