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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7b51cce982d14cc110c6a4673c9aba1bec5b28f9a9b2fda069909dcf2bc33b' 
  AND token = 'QnFWcLEDwz602JxRyzCg3lqd5Z0WdY4iPN0C0zJfZkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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