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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17a0dbe205c8e786cbfd11d1e91940ef328af7c30968dcaaac7ab423a6e986f' 
  AND token = 'nu5SwOKRoooeEFR07/6lzH/BpKqcbxOFw4hd+DAc9Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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