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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d59e6d2205daa927c9d261af00135e35315cf6721b74991c4bc1d0223e823d' 
  AND token = '++ZNPQAbk0R6EvdFS2Qnf+qb9wtzKuP4ua3YT5s3Yc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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