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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86aa6d269dbf0a7274d95f7302c4a669113219249256a107d39f0a5d2eca4548' 
  AND token = '/8tY/f+3dJy3tlyoqxmZotO+jx3Gie5Yn0tcYuGDTRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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