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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfb8b24ffd05e3eed8668c6fad74587be4ffa4a44939e189083bea15cd7eef7' 
  AND token = 'KBvH1kpLk7Z6MUnApZyXUIJW8MT5lijQX8KiRhxJuXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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