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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05ce9dab289e301be64a8d15a3710b2e7cbdda627741a055beba1963998856f' 
  AND token = 'hqxHm4t7GZSDg2pEtN7TH3HBOsZd9IVJw2m4DQlref8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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