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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023763dbacdedbcbf49b19d99bad094b5e6288eda9abf8f01c0402fb886877fc' 
  AND token = 'ZBuKMI9TXQhnjxn9run6RNvBnW67dFZw5u49ft7B3Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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