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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002dff1fd986d3eb24903f849676df41d9c5f0eaeafd2bec6482b2e95e566ea8' 
  AND token = 'x/BI+m8dMVKeQsi3WcVxugVvucbyCHZBznNQIUIPQHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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