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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34845c80c6c5d0de9cc8e78ff416fc8b1241b0dbc39ed98281607d7d0b36ee5d' 
  AND token = '0LWYTNh0WqzVnoSe6c0KzGA9ryXlKEoklVBoAYio/uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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