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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7afae253d81554f22ca6074982b7a62f27e3e375fccbc15ae23928710dfe0eb' 
  AND token = '1CGc13Sy6Jtiltack4drDm6lz8yhXjP2ZMhNlH8JouE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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