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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae44732f1e895f2849fa2cb7893520e5d64966f3ea97ddfec977b246fb9d982' 
  AND token = '1TNfZgR0IZ9SmUNu4O5M/iYycY3AdHulyFOnv0Orxlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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