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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbc4276b3d19636693d8537e5d5b831d66b182db563af4d7cb9095950ae54c7' 
  AND token = '3hHPneqZ0rX8mgfnU3RNM5hZ2rwwgtErgMQS90Q9S/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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