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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7684b6d953fd373672830d6086ab53589e0180187ab4e6500ac71a347c986ba0' 
  AND token = 'PrmL42WCkBfsvPv5Z1v3FawtGCq+Cjq+i7TqvJSW75g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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