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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63ffcc846223db9349715bbbde79d7a8037589a1b451246f719fc8ef6be93a0' 
  AND token = 'OWidt28uQU9WG9zukNoJKOvel8Y8rPeP+ZvWKIDmb8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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