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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1f841d8ca678e144ab9eeef32bff9f868fcf9ac29d1584a691e57e404e252e' 
  AND token = 'YpWT8Kj9pHVGoLrvyxvaEZo92Vl9GTjXM/VE9Sb7Z+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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