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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526e0d2ceb89a19f9a2e86351111a59fd853a3406cb842214e9e3620efa2d18a' 
  AND token = 'j7SzmfngwyCTl8e6xu5fbP/UbZ3so5P9iDNk9Wq8huw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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