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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad3d83d50c9a3163037f75dd749a6ce3d60154863712d53f8d36058ad62428c' 
  AND token = 'm4xAfAp46GZ71Z7LXNsPH/PLtHdjMdstU9Y+Nqv70KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00147

JSON explain

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