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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7328513df4fa125a80e567628ebc93bab7b506bdd2aca9165482331a0939bdfb' 
  AND token = '9KONn0hGcGeWA497B8xZbTm0jEd72Q0a3iwS2+d5TmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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