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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99bcee0d17328005ac1fef13b04c9dd1f2234b2db67259436cafedd7fcab7323' 
  AND token = 'aS5+J7O0vkNshSYeIexkbQpUAPbVgybCMxy2FIitYVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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