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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b070e45cf4e882920987b7fe0a750b2c72c7ba5b3267c09d11841d4e0fd294' 
  AND token = 'hmRTbwxPrtfTliraZsB9GXKVKGWeal333XtNsX/7hg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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