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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee1c6838460a8a06becc8034403dbef511558ac8846bbd6eb11a9cec1c0f08a' 
  AND token = 'CkQF+RawGoOTF2L0EyU9eHmenYgMTVBqs3JmTY6extg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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