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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87957bc8ab6b2cee4d9e14b7c8d0c8ac8760b93a3988e33ff653d407716ba129' 
  AND token = 'Zh5T32tNlpH/8BrWfB4Rf34OlU1byv/w/du+Zgm0yO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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