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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbab053183f8930667ce99bfb38a1b6dae5f89b999c59bb367536460cbeb6631' 
  AND token = 'IZhNaayQOTmAFCb9Sqmjpr5i3f3z3kFWoliW5B9eIho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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