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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b7e6107acec5765783abf9ac15bccdcda5ad3c8347d74afc2ae45cfa732f3c' 
  AND token = 'TWalumvtPLJ/neMgNP8OG9O8URo0OK/sGq8mF5di46U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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