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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28d76ad62fa483eb515f198a587778e7ad6f50218128687b3663bea67f71108' 
  AND token = 'QYaw+TNztp7NAzu8cxfqRRYHB3ddMpFJAaGbEJ6OcJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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