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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf2be553a171d086f1501dd6bf76ff1aa30c9fd05862411485088e90aa51aae' 
  AND token = '9ERrMwbihXDHL2+1oxqNQTCRjS7ykHckfGgQLObX0eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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