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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034d41d68c3f3a7c8ad887eb5c780ab9008d42cd84cfc0a1a1ba8e8546ea2159' 
  AND token = 'ofHhqEzfrV7ETCfqAb/dD+/JJWp61nOreJYf9pBmWuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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