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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9600c94f56eb6df0fd3e1408622e87770b1f999c6bf44bc63ace415b92fa43c4' 
  AND token = 'q+uA8YxbrxsCqtqyoL5+G0HSYlVtkWjenkr8Js0OELQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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