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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2e0ee8caf0c3048499e0e60d43ebd2d12d080b724b4b77688f9f99409c0ef8' 
  AND token = 'zVGfc5acMhx7iOuGQjxfWh8zEB9L9ynyj8ZGfwoZYlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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