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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9544aea5228631aec15c51ef7da2ebdce19cfa0960a04ce217546cf4d062a200' 
  AND token = 'Jma0Mn9poeI58Uy6sHqYI/YruNf93o2rOEw8e0RxCUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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