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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63165c281ff32c80a09169d70a6575e373c3e01a510cd073b88d33f7ff9944d' 
  AND token = 'wDbiEyJhIIFqICaUnWePZIqs6hKEUeDokazganqgews=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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