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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3240b8bd9107629e6e6f501f8b1dbf6e46fda26426f2f0e0e1c62cf5c1c24c' 
  AND token = 'xGhtmU7YAlzFILFPyDMsIA7J5B4EMSFqGrMIF7D09cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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