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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d50b31f83c400ab7da7f24529b7b09dad6fd5bb9594f4e830c4aaa0b14d8bad' 
  AND token = 'WRgHUZ/btSrgu9cWIzTrvimsirkguxbgcSxdDAzNdZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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