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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1f1df2a39eab88f2d388682bf36f502bc99226942b0811a6d930b1f2da17a8' 
  AND token = 'oTcHo0cwmtihJI58hPWTtdb4oQ//bpjW76vs9kbkGDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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