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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79fddff998442e12b4cb3c48f29df5ed1f6b5ee5c58c95507284e5a5886fa0f' 
  AND token = '4PtK2dXp/7w5aSjucYRyvsrqnJB2eeQGKcx3pFpKonI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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