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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d240f72cffc35357595b81c6522aae4774a316144486cccead6b8b0e1916347' 
  AND token = 'o5x137Q+M3mUvQB10n+5Evc626pHXMNYgT0rknsqNl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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