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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678378ca3def6534e7dd68539a98f50cb5165a3a207f5e0101266890799d341b' 
  AND token = 'Ll/swMXhyrrU8VHpF6ptBGp87Et4B0jA07E82orQkMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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