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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3169b4a962f76c4662375828f6b36a0da28866af733a9fc26bcbcd2a8dd03ceb' 
  AND token = '+lYp3z6YdxZRY4m+OSt/dYQmn0wvVGhOlyOate7dQuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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