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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c04c3df7e07a94fe25b923cd27b50bcbf37f8dbaac0c889269d54187df6bdbb' 
  AND token = 'XmoxCcFq45ZvJ/N4XyEb04hZU1krtX5XPS2DmLEH8bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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