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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8de181a1e5220351446e0d6ad23dd8ec50bd52fe9b45ab25ff274e251dfa2eb' 
  AND token = 'EL6fOCXxCcTeXhGIXJfJ6ez1ROXNeFMQw+B12BoggQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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