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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c32427dbfce8b7f06743d4e7413b4a01ee91f12b591021c8c4b74f0dc0f7dd7' 
  AND token = 'CXQ8ZxV5TFGCzojV8VPflxLXDr/Yai0RAdyBK4W4QxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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