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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f5741d33c66577f7b004abd3e1e4f1059754f85e84475e1d7bc3896df8aa8e' 
  AND token = 'HMh90Y0ejfe20qGRHR3aGHIVcmjL7Ts7HYif2q6wPvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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