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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9235ec7881bcdeb2c9be3f6e1632cdc888d72ac2381613328eeaa758f46c59a' 
  AND token = '/KtFaiYuzZO253U3NrVXGWAmxLBXTpICJ4PAolvVi0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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