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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41eb6c5df57c175d6718577ffaacf547a1620d8bbb80b17e60cf2c9511d5be87' 
  AND token = '1xv+IBrvgZg6g0TYPDzJTwqS8oUSkWl/5e3SPDKTU+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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