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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642a56334e0f3393b7de1d5a5b47d8f5e3ab0690fdedff6153b14cac1c9d55e3' 
  AND token = 'S7yZpwvYiR+iOeLneWpCcziL0047xf9p2GpkZAFfY3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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