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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfb27d79504101515f8445e7e372c4ac3b0bd9b42b8d4ecfe2736bd713efc62' 
  AND token = 'emMh/WcIMxdS3iQaDP6ZNjnfB1grF6zEc8YpSnEtwps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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