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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b95337f611cc7549e97e7c4e46ce6bb2889b7142af99e8a4f96446ae877e14' 
  AND token = 'cQ6C69XtP+xi9rqIigq+8KB6Tk6O3aiglPgu/SMPuSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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