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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcf670faae5918e5d19f823bedc1c0fc2a93e85ef18ae5691033473a0ca982a' 
  AND token = 'us0zrzqCj0U/3mptmvGBROZAwo+QO9poO4Ax9OKsurE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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