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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93086aff56e857cb0c9756ec9d74a494a10548ff8fdf9ff52ec83219bc40b6f' 
  AND token = '9QFW0TXRiCZRRAxVLIk2zRlpuhjz8dkA5ER6IhKtebE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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