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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ccc934c75104f6b583aa4e409202efb065e5c84c925fb467cb66cdb7d3ca8d' 
  AND token = 'UW7G6BD/k7XH58V+ySlr2dp6cFjJPjM1oDdY18DLYzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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