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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a6d8a3241dccf4c7d0bb24d6265139d8540960db3cc4d7ec454d0acc80442d' 
  AND token = 'fcsX/6FXJiCKsTOCRgtzCtQ+FyYj2qlb9Xa1dBBXKLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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