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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cf596e663049feac2bf5e97916ec96d85d4a9a23ae371c5d8c122331775e14' 
  AND token = 'KckWWKWkT+ne0txG4ckV03eTdIaJx7wJAzQVAPdfoUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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