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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b469c60d19d52341d2fc65dd34c37a6cb5efe4867558d8fa00747ca092b8117' 
  AND token = 'WhSmDRyTIS0GgmHgOzlihF1oZUdyxOF+Xj231+ro5w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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