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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7038b8d7af7bf013e81b50ddc2d380a4639c1872145db05dbb319c1788be1bee' 
  AND token = 'ZlgpgbwRcI+6K90ZPRTCHalOx0+/q7Hh9yDENl4QsJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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