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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b5b53c17108b111aee20c44d1bdc8c0258d73430c566f03ee41215cf6179b4' 
  AND token = 'XDQiHgJhAfbnYiZwblzVFiNirrcAq4qs1GNPFcp11eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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