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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594b7a05ec15d275f304adf9bb26110f5a4ebac1640baeed2d45f4c21fe215ec' 
  AND token = 'paJlGKjFdzjt7d8/18o1tv9MTIqm3Ur1t1nGsMDI9wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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