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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9698907d8135cbd707c5d84317d4414a5ecc04f8ceaf4aa6bce53c1122d69e' 
  AND token = 'iFNG1g8uNi8u0qEfwQLHOzGsdKW7Hz8Y0h7COqAg5WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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