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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6636c0c9c82860c6f919929fb01de575206ad8b697956d99eccfa8accc8eb76e' 
  AND token = '2EbRhVfeqdw6veS/4ZmH5QiFBYfRIYLZeJHA04KXpXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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