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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5beb082905bcdd5c3f416b7cead26184cdac7f77e58eb3c59cdcf4ab2409518' 
  AND token = 'HEGZ/eSdLoDBmbNvwvQI9Z6fHoZzmQ6BtcI/0TEyqtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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