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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3284c62e2d3ae0c24ae0ef320ca68d0663c4f2fa8e13191c4e641b6850b867d' 
  AND token = 'jHSVnl/uhLm9wC69NPwPl7L5XnCE7TSWh+o/i5SXNLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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