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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1d3a3421317cf2387a14bc9e9c9fdaeb9f487b34e5404ff5d5a32e7adfe86c' 
  AND token = 'sTtS9LgANSo7tl9vatBFikyLrXDFF8ud6u0pQfmZJQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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