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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae5515a1f22ede5146df2db7e22cd89a7f29545828dbbcd5f243d1495273fdf' 
  AND token = 'aTfkY1Gj46EDNf8euLL1Cq0hGNrwZqV9E2GdsuWLYVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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