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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5492847d76d5acc3defd3135991c62b0923d7a6aa8f17c21e916ac9d8d2e4a13' 
  AND token = 'pxvaVtOrP302zO9LTh+70UCIiK/61OKoU+Axs61d9jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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