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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c5d423cad2709eceaebe2251a43862d253f24e7c6df4a99616747eb0a8c7eb' 
  AND token = 'WBybTicZHo0aC5QDMovm8QDmVWNXhLGw0PSKyMjhE3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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